21650205631 has 8 divisors (see below), whose sum is σ = 22166562240. Its totient is φ = 21136170528.

The previous prime is 21650205623. The next prime is 21650205659. The reversal of 21650205631 is 13650205612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21650205631 - 2³ = 21650205623 is a prime.

It is a super-2 number, since 2×21650205631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21650205593 and 21650205602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650200631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561496 + ... + 598813.

It is an arithmetic number, because the mean of its divisors is an integer number (2770820280).

Almost surely, 2^21650205631 is an apocalyptic number.

21650205631 is a deficient number, since it is larger than the sum of its proper divisors (516356609).

21650205631 is a wasteful number, since it uses less digits than its factorization.

21650205631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160753.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 21650205631 in words is "twenty-one billion, six hundred fifty million, two hundred five thousand, six hundred thirty-one".